<template>
   <div class="wrapper">
			
			<!-- header部分 -->
			<header>
				<p>商家信息</p>
			</header>
			
			<!-- 商家logo部分 -->
			<div class="business-logo">

            <img :src="business.businessImg">

             </div>



           <!-- 商家信息部分 -->

        <div class="business-info">

        <h1>{{business.businessName}}</h1>

        <p>&#165;{{business.starPrice}}起送 &#165;{{business.deliveryPrice}}配送</p>

        <p>{{business.businessExplain}}</p>
         </div>
			
			<!-- 食品列表部分 -->
			<ul class="food">
				<li v-for="(item,index) in foodArray">
					<div class="food-left">
						<img :src="item.foodImg">
						<div class="food-left-info">
							<h3>{{item.foodExplain}}</h3>
							<p>{{item.foodName}}</p>
							<p>&#165;{{item.foodPrice}}</p>
						</div>
					</div>
					<div class="food-right">
						<div>
							<i class="fa fa-minus-circle" @click="minus(index)" v-show="item.quantity!=0"></i>
						</div>
						<p><span v-show="item.quantity!=0">{{item.quantity}}</span></p>
						<div>
							<i class="fa fa-plus-circle" @click="plus(index)"></i>
						</div>
					</div>
				</li>
			</ul>
			
			<!-- 购物车部分 -->
			<div class="cart">
				<div class="cart-left">
					<div class="cart-left-icon">
						<i class="fa fa-shopping-cart"></i>
						<div class="cart-left-icon-quantity"  v-show="totalQuantity!=0">{{totalQuantity}}</div>
					</div>
					<div class="cart-left-info">
						<p>&#165;{{totalPrice}}</p>
						<p>另需配送费3元</p>
					</div>
				</div>
				<div class="cart-right">
					 <!-- 不够起送费 
				
					<div class="cart-right-item">
						&#165;15起送
					</div>
					
					 达到起送费  -->
					<div class="cart-right-item"  @click="toOrder()" >
					    去结算
					</div>
				</div>
			</div>
			
		</div>	
</template>

<script>
 export default{
	data(){
		return{
			//获取到query的参数
           businessId:this.$route.query.businessId,
		   business:{},
		   foodArray:[],
		    user:{},
			total:0,


		   
		}
	},created(){
		//从sessionStorage中获取到用户信息，如果没有此用户的信息，返回null
		this.user =this.$getSessionStorage('user');
		//通过axios向后台发送异步请求
		this.$axios.post('BusinessController/getBusinessById',this.$qs.stringify({
			businessId:this.businessId
		})).then(response => {
			//如果请求成功从后台获取数据
			this.business = response.data
			console.log(response.data)
		}).catch(error => {
			console.error(error)
		})


		this.$axios.post('FoodController/listFoodByBusinessId',this.$qs.stringify({
			businessId:this.businessId
		})).then(response => {
			//如果请求成功从后台获取数据
			this.foodArray = response.data
			console.log(response.data)
			for(let i=0;i<this.foodArray.length;i++){
				this.foodArray[i].quantity=0; 
				if(this.user!=null){
					this.listCart();
					
				}
			}

			
		}).catch(error => {
			console.error(error)
		})
		this.deliveryaddress = this.$getLocalStorage(this.user.userId);
	},
	methods:{
       listCart(){
		this.$axios.post('CartController/listCart',this.$qs.stringify({
			userId:this.user.userId
		})).then(response => {
			//如果请求成功从后台获取数据
			this.userId = response.data
			console.log(response.data)
		}).catch(error => {
			console.error(error)
		})
	   },
       
		minus(index){
			//首先验证是否登录  判断用户是否存在如果不存在就跳转到login页面
			if(this.user==null){
			this.$router.push({
            path:'/login'
			})
			}else{
				if(this.foodArray[index].quantity > 0){
		this.updateCart(index,-1);
				}else{
				this.removeCart(index);

				}
			}
			
		},
		plus(index){
		
          //首先验证是否登录  判断用户是否存在如果不存在就跳转到login页面
			if(this.user==null){
			this.$router.push({
            path:'/login'
			})
			}else{
				if(this.foodArray[index].quantity == 0){
					this.saveCart(index);
				}else{
					this.updateCart(index,1);
				}
			}

		},
        saveCart(index){
          this.$axios.post('CartController/saveCart',this.$qs.stringify({
			businessId:this.businessId,
			userId:this.user.userId,
			foodId: this.foodArray[index].foodId
		})).then(response => {
			//如果请求成功从后台获取数据
			if(response.data==1){
				this.foodArray[index].quantity=1;
				//添加完食品需要排序
				this.foodArray.sort();
			 }else{
				alert('向购物城当中添加食品失败');
			 }
		}).catch(error => {
			console.error(error)
		})
		},
        updateCart(index,num){
			
		this.$axios.post('CartController/updateCart',this.$qs.stringify({
			businessId:this.businessId,
			userId:this.user.userId,
			foodId: this.foodArray[index].foodId,
			quantity: this.foodArray[index].quantity+num

		})).then(response => {
			//如果请求成功从后台获取数据
			 if (response.data != 0) {
						//此食品数量要更新为1或-1；
					this.foodArray[index].quantity+=num;
						this.foodArray.sort();
					 } else {
						alert('向购物车中更新食品失败！');
					 }
				}).catch(error => {
					console.error(error);
				});
				},
		removeCart(index) {
		 this.$axios.post('CartController/removeCart', this.$qs.stringify({
					businessId: this.businessId,
					userId: this.user.userId,
					foodId: this.foodArray[index].foodId
				})).then(response => {
					if (response.data != 1) {
						//此食品数量要更新为0；视图的减号和数量要消失
						this.foodArray[index].quantity = 0;
						this.foodArrayort();
					 } else {
					 	alert('从购物车中删除食品失败！');
					 }
				}).catch(error => {
					console.error(error);
				});
			},
			toOrder() {
				this.$setSessionStorage('businessId',this.business.businessId);
				this.$setSessionStorage('total',this.totalSettle);
				this.$router.push({
				    path:'/order',
					query: {
						// businessId: this.business.businessId,
						// orderTotal: this.total,
						
					}
				});
			}
		},
		computed: {
			//食品总价格
			totalPrice() {
				let total = 0;
				for (let item of this.foodArray){
					total += item.foodPrice * item.quantity;
				}
				return total;
			},
			//食品总数量
			totalQuantity() {
				let quantity = 0;
				for (let item of this.foodArray){
					quantity += item.quantity;
				}
				return quantity;
			},
			//结算总价格
			totalSettle() {
				return this.totalPrice + this.business.deliveryPrice;
			}

		}
	}


</script>

<style scoped>
/****************** 总容器 ******************/
.wrapper{
	width: 100%;
	height: 100%;
}

/****************** header部分 ******************/
.wrapper header{
	width: 100%;
	height: 12vw;
	background-color: #0097FF;
	color: #fff;
	font-size: 4.8vw;
	
	position: fixed;
	left: 0;
	top: 0;
	z-index: 1000;
	
	display: flex;
	justify-content: center;
	align-items: center;
}

/****************** 商家logo部分 ******************/
.wrapper .business-logo{
	width: 100%;
	height: 35vw;
	/*使用上外边距避开header部分*/
	margin-top: 12vw;
	
	display: flex;
	justify-content: center;
	align-items: center;
}
.wrapper .business-logo img{
	width: 40vw;
	height: 30vw;
	border-radius: 5px;
}

/****************** 商家信息部分 ******************/
.wrapper .business-info{
	width: 100%;
	height: 20vw;
	
	display: flex;
	flex-direction: column;
	justify-content: center;
	align-items: center;
}
.wrapper .business-info h1{
	font-size: 5vw;
}
.wrapper .business-info p{
	font-size: 3vw;
	color: #666;
	margin-top: 1vw;
}

/****************** 食品列表部分 ******************/
.wrapper .food{
	width: 100%;
	/*使用下外边距避开footer部分*/
	margin-bottom: 14vw;
}
.wrapper .food li{
	width: 100%;
	box-sizing: border-box;
	padding: 2.5vw;
	user-select: none;
	
	display: flex;
	justify-content: space-between;
	align-items: center;
}
.wrapper .food li .food-left{
	display: flex;
	align-items: center;
}
.wrapper .food li .food-left img{
	width: 20vw;
	height: 20vw;
}
.wrapper .food li .food-left .food-left-info{
	margin-left: 3vw;
}
.wrapper .food li .food-left .food-left-info h3{
	font-size: 3.8vw;
	color: #555;
}
.wrapper .food li .food-left .food-left-info p{
	font-size: 3vw;
	color: #888;
	margin-top: 2vw;
}
.wrapper .food li .food-right{
	width: 16vw;
	display: flex;
	justify-content: space-between;
	align-items: center;
}
.wrapper .food li .food-right .fa-minus-circle{
	font-size: 5.5vw;
	color: #999;
	cursor: pointer;
}
.wrapper .food li .food-right p{
	font-size: 3.6vw;
	color: #333;
}
.wrapper .food li .food-right .fa-plus-circle{
	font-size: 5.5vw;
	color: #0097EF;
	cursor: pointer;
}

/****************** 购物车部分 ******************/
.wrapper .cart{
	width: 100%;
	height: 14vw;
	
	position: fixed;
	left: 0;
	bottom: 0;
	
	display: flex;
}
.wrapper .cart .cart-left{
	flex: 2;
	background-color: #505051;
	display: flex;
}
.wrapper .cart .cart-left .cart-left-icon{
	width: 16vw;
	height: 16vw;
	box-sizing: border-box;
	border: solid 1.6vw #444;
	border-radius: 8vw;
	background-color: #3190E8;
	font-size: 7vw;
	color: #fff;
	
	display: flex;
	justify-content: center;
	align-items: center;
	
	margin-top: -4vw;
	margin-left: 3vw;
	
	position: relative;
}
.wrapper .cart .cart-left .cart-left-icon-quantity{
	width: 5vw;
	height: 5vw;
	border-radius: 2.5vw;
	background-color: red;
	color: #fff;
	font-size: 3.6vw;
	
	display: flex;
	justify-content: center;
	align-items: center;
	
	position: absolute;
	right: -1.5vw;
	top: -1.5vw;
}
.wrapper .cart .cart-left .cart-left-info p:first-child{
	font-size: 4.5vw;
	color: #fff;
	margin-top: 1vw;
}
.wrapper .cart .cart-left .cart-left-info p:last-child{
	font-size: 2.8vw;
	color: #AAA;
}

.wrapper .cart .cart-right{
	flex: 1;
}
/*达到起送费时的样式*/
.wrapper .cart .cart-right .cart-right-item{
	width: 100%;
	height: 100%;
	background-color: #38CA73;
	color: #fff;
	font-size: 4.5vw;
	font-weight: 700;
	user-select: none;
	cursor: pointer;
	
	display: flex;
	justify-content: center;
	align-items: center;
}

/*不够起送费时的样式（只有背景色和鼠标样式的区别）*/
/*
.wrapper .cart .cart-right .cart-right-item{
	width: 100%;
	height: 100%;
	background-color: #535356;
	color: #fff;
	font-size: 4.5vw;
	font-weight: 700;
	user-select: none;
	
	display: flex;
	justify-content: center;
	align-items: center;
}
*/
</style>